Tanker Safety Improvement Act

Tanker Safety Improvement Act - Amends the Ports and Waterways Safety Act of 1972 to require that vessels subject to such Act be constructed and operated using the best available pollution prevention technology.

Requires that vessels of more than 20,000 deadweight tons which are documented under the laws of the United States and engaged in the carriage of oil in bulk to ports of the United States and for which construction is contracted for or begun after January 1, 1978, be equipped with a segregated ballast capacity.